Pyside2 gui calls crashing Maya (MacOS)

[James Porter]

Hey guys,

I’m running the latest Maya 2018 on MacOS. 

I can import PySide2 it’s libraries without any hassle. However, whenever I attempt to load a basic gui (like the code below), Maya freezes and crashes. Anyone else experienced this? Anyone know how to fix it?

Cheers

James

Basic code (I took this from https://github.com/mad-guru/maya/blob/master/_UI_sample):

import maya.cmds as cmds
	import maya.mel as mel
	import pymel.core as pm
	class className():
	def __init__(self):
	self.varA = 1
	self.varB = 2
	self.varC = None
	def definitionA(self):
	self.varC=self.varA+self.varB
	def definitionB(self, userName):
	if self.varC==None:
	return
	print ('Hi '+ userName + ', thanks for visiting.')
	print ('varC is equal to '+str(self.varC))
	# creates instance of this class
	cn = className()
	####################################
	# GUI ##############################
	####################################
	# srinikom.github.io/pyside-docs/
	from PySide2 import QtGui
	from PySide2 import QtWidgets
	from functools import partial
	import maya.OpenMayaUI as mui
	import shiboken2
	def getMayaWindow():
	pointer = mui.MQtUtil.mainWindow()
	return shiboken2.wrapInstance(long(pointer), QtWidgets.QWidget)
	# def className_U1():
	objectName = 'pyMyWin'
	# check for existing window
	if cmds.window("pyMyWin", exists=True):
	cmds.deleteUI("pyMyWin", wnd=True)
	# create a window
	parent = getMayaWindow()
	window = QtWidgets.QMainWindow(parent)
	window.setObjectName(objectName)
	# create font
	font = QtGui.QFont()
	font.setPointSize(12)
	font.setBold(True)
	# create a widget
	widget = QtWidgets.QWidget()
	window.setCentralWidget(widget)
	# create a layout
	layout = QtWidgets.QVBoxLayout(widget) # horizontal QtGui.QHBoxLayout()
	# create buttons
	# imagePath = cmds/internalVar(upd=True)+'icons/blue_field_background.png'
	# button.setStylesheet("background-image: url("+1magePath+"); border:solid black 1px;color.rgb(0,0,0)")
	# A+B button
	button = QtWidgets.QPushButton("A + B")
	layout.addWidget(button)
	button.setFont(font)
	button.setMinimumSize(200, 40)
	button.setMaximumSize(200, 40)
	button.setStyleSheet("background-color: rgb(128,128,128); color: rgb(0,0,0)")
	button.clicked.connect(partial(cn.definitionA))
	#C button
	button = QtWidgets.QPushButton("Print C")
	layout.addWidget(button)
	button.setFont(font)
	button.setMinimumSize(200, 40)
	button.setMaximumSize(200, 40)
	button.setStyleSheet("background-color: rgb(128,128,128); color: rgb(0,0,0)")
	button.clicked.connect(partial(cn.definitionB,'Adnan'))
	# create close button
	closeButton = QtWidgets.QPushButton('Close')
	layout.addWidget(closeButton)
	closeButton.setFont(font)
	closeButton.clicked.connect(window.close)
	# show the window
	window.show()

As I ran Maya from a terminal, I’ve managed to get the following info from it (this is from the moment of running Maya)

objc[2591]: Class RunLoopModeTracker is implemented in both /Applications/Autodesk/maya2018/Maya.app/Contents/MacOS/libQt5Core.5.dylib (0x10a4eef38) and /Library/Python/2.7/site-packages/PySide2/Qt/lib/QtCore.framework/Versions/5/QtCore (0x12e41d010). One of the two will be used. Which one is undefined.

objc[2591]: Class NotificationReceiver is implemented in both /Applications/Autodesk/maya2018/Maya.app/Contents/MacOS/libQt5Widgets.5.dylib (0x10aad79b8) and /Library/Python/2.7/site-packages/PySide2/Qt/lib/QtWidgets.framework/Versions/5/QtWidgets (0x12d45a238). One of the two will be used. Which one is undefined.

*** Recognized (0x69) family*** (30 cols X 22 rows)

Initialized VP2.0 renderer {

  Version : 2016.11.40.12. Feature Level 5.

  Adapter : AMD Radeon Pro 560 OpenGL Engine

  Vendor ID: 4098. Device ID : 0x67EF

  Driver : 4.1 ATI-1.68.20.

  API : OpenGL V.4.1.

  Max texture size : 16384 * 16384.

  Max tex coords : 32

  Shader versions supported (Vertex: 5, Geometry: 5, Pixel 5).

  Shader compiler profile : (Best card profile)

  Active stereo support available : 0

  GPU Memory Limit : 4096 MB.

  CPU Memory Limit: 15564.8 MB.

}

OpenCL evaluator is attempting to initialize OpenCL.

Detected 1 OpenCL Platforms: 

 0: Apple. Apple. OpenCL 1.2 (May 24 2018 20:07:03).

 Supported extensions: cl_APPLE_SetMemObjectDestructor cl_APPLE_ContextLoggingFunctions cl_APPLE_clut cl_APPLE_query_kernel_names cl_APPLE_gl_sharing cl_khr_gl_event

OpenCL evaluator choosing OpenCL platform Apple.

10136

Choosing OpenCL Device AMD Radeon Pro 560 Compute Engine.  Device Type: GPU  Device is available.

Launching SSO process with command line: /Library/Application Support/Autodesk/AdSSO/AdSSO-v2.app/Contents/MacOS/AdSSO-v2 --process_name Autodesk.SSO.DefaultProcess-v2 --server_name Autodesk.SSO.DefaultServer-v2

QWidget: Must construct a QApplication before a QWidget

Stack trace:

  4   libsystem_kernel.dylib              0x00007fff7f971b66 __pthread_kill + 10

  5   libsystem_c.dylib                   0x00007fff7f8cd1ae abort + 127

  6   QtCore                              0x000000012df5af29 QMessageLogger::debug(char const*, ...) const + 361

  7   QtCore                              0x000000012df5c8a0 QMessageLogger::fatal(char const*, ...) const + 224

  8   QtWidgets                           0x000000012d012d2b QWidgetPrivate::QWidgetPrivate(int) + 587

  9   QtWidgets                           0x000000012d147d6e QMainWindow::QMainWindow(QWidget*, QFlags<Qt::WindowType>) + 46

  10  QtWidgets.so                        0x000000012c8be54c Sbk_QMainWindow_Init(_object*, _object*, _object*) + 668

  11  Python                              0x000000010f477ea5 type_call + 245

  12  Python                              0x000000010f40e442 PyObject_Call + 98

  13  Python                              0x000000010f4c1c73 PyEval_EvalFrameEx + 10259

  14  Python                              0x000000010f4c9ff3 PyEval_EvalCodeEx + 2131

  15  Python                              0x000000010f4ca116 PyEval_EvalCode + 54

  16  libCommandEngine.dylib              0x0000000101dcf410 TpythonInterpreter::executeCommand(Tstring const&, bool, bool, TinterpreterResult*) + 784

  17  libExtensionLayer.dylib             0x0000000102ac79c0 QmayaCommandScrollField::createMimeDataFromSelection() const + 1168

  18  libExtensionLayer.dylib             0x0000000102a67832 TidleAction::preDoIdleAction(Tevent const&) + 18

  19  libExtensionLayer.dylib             0x0000000102a67757 TidleDeviceHandlerAction::serverDeleted(TclientServer*, TserverMsg const&) + 343

  20  libExtensionLayer.dylib             0x0000000102a7a363 TeventHandler::doIdles() + 675

  21  libExtensionLayer.dylib             0x0000000102a79fdc TidleTrigger::removeClientHook(Tclient*, Tmetaclass*) + 4092

  22  libQt5Core.5.dylib                  0x000000010a1d55a0 QObject::event(QEvent*) + 48

  23  libExtensionLayer.dylib             0x0000000102a79f1f TidleTrigger::removeClientHook(Tclient*, Tmetaclass*) + 3903

  24  libQt5Widgets.5.dylib               0x000000010a5b4c56 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 294

  25  libQt5Widgets.5.dylib               0x000000010a5b81ce QApplication::notify(QObject*, QEvent*) + 8558

  26  libExtensionLayer.dylib             0x0000000102a6fa2a QmayaApplication::currentMousePos() + 4218

  27  libQt5Core.5.dylib                  0x000000010a1a8c07 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 167

  28  libQt5Core.5.dylib                  0x000000010a200ab1 QTimerInfoList::activateTimers() + 1329

  29  libqcocoa.dylib                     0x00000001235b7e82 QCocoaEventDispatcherPrivate::activateTimersSourceCallback(void*) + 18

  30  CoreFoundation                      0x00007fff579fea11 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17

  31  CoreFoundation                      0x00007fff57ab842c __CFRunLoopDoSource0 + 108

  32  CoreFoundation                      0x00007fff579e1470 __CFRunLoopDoSources0 + 208

  33  CoreFoundation                      0x00007fff579e08ed __CFRunLoopRun + 1293

  34  CoreFoundation                      0x00007fff579e0153 CFRunLoopRunSpecific + 483

  35  HIToolbox                           0x00007fff56ccad96 RunCurrentEventLoopInMode + 286

  36  HIToolbox                           0x00007fff56ccab06 ReceiveNextEventCommon + 613

  37  HIToolbox                           0x00007fff56cca884 _BlockUntilNextEventMatchingListInModeWithFilter + 64

  38  AppKit                              0x00007fff54f7ba73 _DPSNextEvent + 2085

  39  AppKit                              0x00007fff55711e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044

  40  AppKit                              0x00007fff54f70885 -[NSApplication run] + 764

  41  libqcocoa.dylib                     0x00000001235b8aad QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2205

  42  libQt5Core.5.dylib                  0x000000010a1a4f31 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 401

  43  libQt5Core.5.dylib                  0x000000010a1a92ea QCoreApplication::exec() + 346

Fatal Error. Attempting to save in /var/folders/34/y46587hs3q34swhhkl0fblcc0000gn/T/james.20180902.1004.maWriting crash report in /var/folders/34/y46587hs3q34swhhkl0fblcc0000gn/T/james.20180902.1004.crash

[Justin Israel]

This crash is expected if you are running that example code from a terminal. Qt applications always need a QApplication instance to be created first, and to then exec it to start the event loop. When you are inside the Maya UI there is already an instance of QApplication running so you don't have to do it yourself. So that bring said, have you tested this code from the Maya Script Editor? 

In this terminal output, you can also see that it is warning you that it is picking up your system PySide2, causing it to load two versions of Qt5. This is also a potential for crashing once you get beyond the problem of not having created a QApplication in the terminal. You have to make sure you pick up Maya's PySide2 first. 

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